Packing and method for forming the same



Nov. 29, 1932. c. D. MCPHERSON 1,889,287

PACKING AND METHOD FOR FORMING THE SAME Filed July 17, 1930 3nventor 6T 2M6 fiwrsom Mar n M1 4' attorney Patented Nov. 29, 1932 eminence n. McrnnR'son, or PHILADELPHIA, PENNSYLVANIA, lassIGNoR we citAn:

sneer.lmbrnnasonurniiuennn s. HEIBERGER, TRADING As THE Ma -zen);

' CHEMICALTCQMPA'NIOF, Permian-tram, PENNSYLVANIA,

\ rnokme AND mnriton FOR FORMING THE sAME.

Application filed July" 1-7,

form toathe piston or rodwhen the packing nut I or gland is compressed thereupon and in this way an 'improved packinghavin su perior leak-proof qualities isprovide Withthe foregoing; and other objects in view, the inventiouwill be more fullyde scribed hereinafter, and will be morepam ticularly pointedout in the-claimsappende'd hereto. I1 In the, drawing, wherein like symbols re fer to like or corresponding parts throughout the several views; M r Figure 1 is a perspective viewof" the improved lead "or lead alloy ingredient show ingfin dotted lines the method of forming 13 the same i Figure 2 is. anedge view of such ingredi ent." Figure 3 showsthe packing in loose form; Figure 4 is a magnified view of a small por- 3 tion of the packing. y v j V H i Figure 5 is aperspectiveview of thepacking compressed in ring form as itexistsin the 'stuffingbox, and q 1 Figure .6 is a crosssectio'n taken on the 9 line 6-6 in Figure 5rv a Referring more particularl'yto' the drawing, in Figure '1' I' have shown a piece of the lead or lead alloyindicated at? having therein numerous pores '8 r and; an irregular 5 and ragged edg'e'9. ,Theleadingredient'Z 1980. Serial No. 468,643

is of athin form as indicated Figure-,2 '1

but having relatively'great lateral and longitudinal extension. 8

The lead-in thisconditionmay be produced by heating the same to molten condition whereupon the lead is dipped by the ladle l0 from the container and dropped upon water or ahard surface whereupon the highly heatmolten lead will spread out to theat tenuatedand porous 'form' shownhaving the irregular and ragged edge which is intended to catch in the fiber ingredientof the pack ing The porous form of the lead-,;wh'en enmeshed with the asbestos, as indicated in Figure'et, willalso have the effect topermitthe' asbestos to'readily and freely give up its-en trained oila V v The packingc'onsists ofthe fol-lowingim gredients:asbestos, light' hemp; or, other fiber, lubricating oil, graphite, lead or lead alloy, rawhide (this is an additional option a'l ingredient used for" hydraulic packing). Theingredie'nts may e mixed in any desired proportions, the lead being-in the condition alreadydescribed. V

The asbestos resists burning out,- absorbs the oil andrenders the packing self-lubrioating,- The asbestos'or fiber givesibody tothe" packingz' The asbestos or fiber is'preferably in shredded formin order tli'atit may co operate better with'the lead? closing uporrthe fib'er strands to bind the lead andthe. asbestos together. When-the eoinposition is-thus tied together it will not-so readily Work: outof-the stuiiingbox or blow out'of the stuffingbom i Any desiredlubricating oil may be a used but preferably a heavy grade'of cylinder oil is employed, as a heavy oil willnot so readily flow out; of theporesof the asbestos or fiber at normal temperatures; .The heavy oil is preferably first heated to render it more fluid and penetrating whereby it will more readily be absorbed within the pores of the asbestos or" fiber. 1 The asbestos has high absorptive qualities'an'd will take upa large portion of the oil. The packing may be handled without the oil exuding therefrom, but under the high temperature encountered in the bearings, the asbestos will readily give up its oil.

The graphite acts in its usual capacity for lubricating and smoothing. It is preferably a heavy graphite in granular form as the light pulverized graphite is apt towork out of the stuffing box. The graphite is preferably 111 flake form which will additionally avoid its working out.

The lead or lead alloy, lead and tin, lead and brass, et c., acts. as a filling and a body to theicomp'ou'nd and it binds and locks the other ingredients together.

The lead is soft and will not injure the piston or cylinder walls and it locks the entire packin into an integral whole, preventing the pac ing from blowing out.

The rawhide, used particularly in the hydraulic, packing, will absorb the water and moisture and swell therewith making the packing more secure, preventing its working and blowing out and forming a tighter joint. The extreme toughness of the rawhide makes it adaptable for the purpose and insures that the packing will hold and will not cut out.

In the mixing of the packing, the same may be done in a rumble, that is a drum rotated constantly at slow speed into which the ingredients are introduced. The rumble is preferably heated to a low degree preventing the mixture from sticking thereto. The ingredientsmay be introduced in any order, it being preferred that the asbestos and rawhide be added first. The oil in a highly heated condition may be then poured in to be absorbed by the asbestos,-and the graphite and lead are then added.

In Figures 3 and 4, theasbestos is indicated at 11 as having the oil and a percentage of the graphite absorbed thereby; and the lead is indicated at 7 there being also a percentage of loose graphite in the mixture. Where rawhide is used this rawhide will be in shreds or small pieces.

The packing will be packaged and shipped in the loose form indicated in Figure 3, there being no necessity for pre-molding it in ring form as is ordinarily done'with packings at present. In the loose form it maybe pushed into the stufling box in'any desired quantity and the packing nut or gland is then tightened, compressing the loose packing into a compact ring 12 as indicated in Figures 4 and '5. This ring is substantially homogeneous "throughout.

Owing to the nature of the composition, its ingredients and their method of compounding, a light pressure will compact the material and the packing nut may be tightened up from time to time so as to effectually avoid leakage. 1 p

' In the'first instance, after the loose packing has' been loaded into the stuffing box,

to the movement of the rod.

The improved packing is of general application. For instance, at the present time on ship-board several different kinds of pack ing are necessary and the ships stores must contain a variety of packings. With the improved packing according to'the present invention, such improved packing will serve all purposes and make it necessary only to carry the one kind of packing.

The improved packing, unlike the premoldedring variety, may be used over and over again.

When rawhideis used, the amount of the asbestos or other fiber may or may not be cut down. Also, a'less amount of oil may be incorporated as the rawhide has a greasy nature.

It has also been found that by dropping the melted lead in the oil, such for instance, as a crude petroleum, very excellent results are obtained.

Furthermore, we reserve the right to use, instead-of the graphite alone, a mixture of graphite and mica. In such case a mixture of preferably equal parts of graphite and ground mica is used.

Wherever the term lead is used in the claims it will be understood to mean not only the pure metal but also the alloys thereof.

What is claimed is p 1. The herein described method for forming a loose packing material, which comprises heating lead to a molten condition, dropping the molten lead upon the surface of a body of liquid to cause the highlyheated molten lead to spread out to an attenuated and porous form having irregular and ragged edges, highly heating heavy lubricating oil, pouring such highly heated oil upon shredded asbestos undergoing agitation under mild heat conditions whereby the asbestos will rapidly take up great quantities of the heavy oil, and adding graphite and the attenuated porous lead piecesto the oil saturated asbestos during agitationunder mild heat. I 2. The herein described method for forming a loose hydraulic packing, which consists in heating lead to a molten condition, dropping the molten lead from a height upon an object surface whereby to cause the lead to spread out in an attenuated and porous form having ragged and irregular edges, introducing shredded asbestos and rawhide into a rumble subjected to mild heat, separately highly heating heavy lubricating oil and pouring same into the rumble to be taken up in great quantities by the asbestos, and adding graphite and pieces of such attenuated and porous lead with ragged edges into the rumble.

3. An improved composition for hydraulic packing comprising asbestos in shredded form, bearing lubricating oil absorbed by the asbestos, graphite rawhide to permit moisture absorption" whereby to swell the packing, and lead in thin and porous form adapted to bind the ingredients, together when compressed.

In testimony whereof I afiix CLARENCE D. MGPHERSQN- my signature. 

